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<head>
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	<title>Document</title>
	<link rel="stylesheet" href="mycss.css">
	<style type="text/css">
	.box span{color: green;}
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<body>
	<p>这是css样式</p>
	<p class="box">父代选择器<span>子选择器</span></p>
	<p>图片标记是行块元素</p>

	<div>学并思</div>
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